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IBM was ranked as the second-largest U.S. firm in number of employees by Fortune in 2012. As of the end of 2013, IBM operates 12 research laboratories around the world. Employees at these research laboratories are responsible for many modern inventions, including the automated teller machine, magnetic stripe cards and hard disk drives. Although IBM is one of America's largest multinational firms, as of 2013, its employees do not actively participate in a union.